[Qgis-developer] QgsMapSettings: store layer pointers instead of layer ids?

[Sandro Mani]

On 03.08.2016 15:44, Martin Dobias wrote:
> Hi Sandro
>
> On Wed, Aug 3, 2016 at 3:25 PM, Sandro Mani <manisandro at gmail.com> wrote:
>> Hi
>>
>> For a project I need independent QgsMapCanvas instances, in particular a
>> child view which is unrelated to the main view (including its layertree).
>> (Easy example: the main view displays a city, and if the user clicks on a
>> "show building schema" button in the building feature attribute dialog, the
>> schema of the building is opened in a secondary view. The layers of the
>> building schema should not appear in the main layer tree however).
>>
>> Currently this is not possible: while one can set the layers individually
>> for each QgsMapCanvas, the QgsMapSetting ends up storing the layer ids and
>> hence they must be stored in the QgsMapLayerRegistry. Items which are stored
>> in the QgsMapLayerRegistry will always be visible in the application legend
>> tree.
> You can use QgsMapLayerRegistry.instance().addMapLayer(layer, False) -
> the layer will get to the registry, but it will not end up in the
> layer tree. Doesn't it solve your problem?
Oh, why think small when you can think big... I think I somehow just 
completely missed that :)

Thanks!
Sandro